package com.sky.service.impl;

import com.fasterxml.jackson.databind.ser.Serializers;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     * @return void
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        //判断加入购物车的这个商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在，则数量加一
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在，需要插入一条购物车数据

            //判断添加的数据是菜品数据还是购物车数据
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //是菜品数据
                Dish dish = dishMapper.getById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            } else {
                //是套餐数据
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     *
     * @param
     * @return List<ShoppingCart>
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前用户id
        Long currentId = BaseContext.getCurrentId();

        ShoppingCart build = ShoppingCart.builder()
                .userId(currentId)
                .build();

        List<ShoppingCart> list = shoppingCartMapper.list(build);

        return list;
    }

    /**
     * 清空购物车
     *
     * @param
     * @return void
     */
    @Override
    public void clean() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(currentId);
    }

    /**
     * 删除购物车中一个商品
     *
     * @param shoppingCartDTO
     * @return void
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        Long currentId = BaseContext.getCurrentId();

        ShoppingCart build = ShoppingCart.builder()
                .userId(currentId)
                .build();

        BeanUtils.copyProperties(shoppingCartDTO, build);

        List<ShoppingCart> list = shoppingCartMapper.list(build);

        if (list != null && list.size() > 0) {
            ShoppingCart shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if (number == 1) {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}